install github action to build and test on commit

[phelps-sg]

Configured github actions for continuous integration workflow to test that the build works.

• uses sbt-coverage to generate coverage reports (see Missing unit tests #24)
• uses scalafix to lint code
• uses scalafmt to ensure code is formatted consistently (helps avoid complicated merge conflicts)
• changes from the above plugins applied to source files

I cannot easily test my end but give me a shout if it doesn't work and I will see if I can help.

[peterbanda]

Hey @phelps-sg ,

This looks good! However, pls. rollback all the scalafmt and scalafix reformats/refactors. Too many changes to check...
Once it's merged I will set it up and apply to the source base myself to be compatible with the project preferences (e.g. 2 spaces instead of 4 for params).

Thanx!

[phelps-sg]

I have reverted the formatting and scalafixes while retaining the corresponding plugins.
Note that this will cause the automated continuous integration checks to fail, since they check the code is properly formatted and that there are no linting issues.

To see the changes recommended by the linter:

sbt 'scalafix --check'

To apply the above changes automatically:

sbt scalafix

To see which source files have formatting issues:

sbt scalafmtCheckAll

To automatically format source code:

sbt scalafmtAll

[peterbanda]

OK, looks perfect! Appreciate your effort.